To highlight text in pdf files, I select the text and hit the highlight button:
The default was yellow highlight. Somehow, it got changed to a red underline. How can I change this back to yellow highlight again?
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The Preview help mentions:
Use highlight mode: Click the Highlight button (so it turns blue), click the down arrow next to the Highlight button, then choose a highlight color, underline, or strikethrough. Now, whenever you select some text, the highlighting style you chose is automatically applied to the text.
So de-select any text in an open PDF. Click the Highlight button - nothing should be highlighted additionally in your PDF now - click the down arrow and choose a color or strikethrough.
You can also determine several different highlight colors in a single PDF with this method (here yellow, pink and underline):